[Usage]R22 is also know as HCFC-22, Freon 22, Chlorodifluoromethane or Chlorodifluoromethane. It is used in reciprocating compressor, as refrigerant in industrial, commercial and household air-condition system; also used to produce insecticide and aerosol for spraying paint; to produce extinguishing agent 1211; as the basic material to produce a wide variety of fluorinated macromolecular compounds.